This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A028489 #8 Feb 05 2023 11:53:01 %S A028489 17,19,79,139,907,1907,2029,4801,5153,10867 %N A028489 Duplicate of A005808. %C A028489 The original definition, "Exponents of generalized rep-units in base 11", lacks the requirement of primality. - _M. F. Hasler_, Mar 19 2013 %K A028489 dead %O A028489 0,1 %A A028489 Jean-Yves Perrier (nperrj(AT)ascom.ch)